Here's how you can install power commands that let you use the Dash to shut down, hibernate, suspend or restart your Ubuntu 14.04 system.
1. Open a terminal window.
2. Type in the following commands then hit Enter after each.
sudo add-apt-repository ppa:atareao/atareao
sudo apt-get update
sudo apt-get install power-commands
This stuff is developed by atareao and you can use their PPA to install it.More at Noobs Lab
Additional Ubuntu Resources